document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=582392>Question 582392</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me solve this equation: <BR>\n" );
document.write( "Equation of line passing through (-7,-9) and perpendicular to 8x-9y+2=0<BR>\n" );
document.write( "What I've tried: y=-8/9x+2/9  PL: y=9/8x+b EQUALS -9=9/8(-7)+b ???<BR>\n" );
document.write( "Help please. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #372048 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=372048\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In general, if the line is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+y+=+m%5B1%5D%2Ax+%2B+b+ ALIGN=MIDDLE  ALT=\"+y+=+m%5B1%5D%2Ax+%2B+b+\"   DISABLED_style= \"max-width:90%; height:auto;\" >,<BR>\n" );
document.write( "then the line perpendicular to it has a slope<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+m%5B2%5D+=+-%28+1%2F%28m%5B1%5D%29+%29+ ALIGN=MIDDLE  ALT=\"+m%5B2%5D+=+-%28+1%2F%28m%5B1%5D%29+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "given:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8x+-+9y+%2B+2+=+0+ ALIGN=MIDDLE  ALT=\"+8x+-+9y+%2B+2+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+9y+=+8x+%2B+2+ ALIGN=MIDDLE  ALT=\"+9y+=+8x+%2B+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+y+=+%288%2F9%29%2Ax+%2B+2%2F9+ ALIGN=MIDDLE  ALT=\"+y+=+%288%2F9%29%2Ax+%2B+2%2F9+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Any line perpendicular to this one has slope <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+m%5B2%5D+=++-%281%2F%288%2F9%29%29+ ALIGN=MIDDLE  ALT=\"+m%5B2%5D+=++-%281%2F%288%2F9%29%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+m%5B2%5D+=+-%289%2F8%29+ ALIGN=MIDDLE  ALT=\"+m%5B2%5D+=+-%289%2F8%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "------------------<BR>\n" );
document.write( "given that the line passes through (-7,-9 )<BR>\n" );
document.write( "Now use the point-slope formula:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+y+-+%28-9%29+%29+%2F+%28+x+-+%28-7%29+%29+=+-%289%2F8%29+ ALIGN=MIDDLE  ALT=\"+%28+y+-+%28-9%29+%29+%2F+%28+x+-+%28-7%29+%29+=+-%289%2F8%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+y+%2B+9+%29+%2F+%28+x+%2B+7+%29+=+-%289%2F8%29+ ALIGN=MIDDLE  ALT=\"+%28+y+%2B+9+%29+%2F+%28+x+%2B+7+%29+=+-%289%2F8%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply both sides by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8%2A%28+x+%2B+7+%29+ ALIGN=MIDDLE  ALT=\"+8%2A%28+x+%2B+7+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8%2A%28+y+%2B+9+%29+=+-9%2A%28+x+%2B+7+%29+ ALIGN=MIDDLE  ALT=\"+8%2A%28+y+%2B+9+%29+=+-9%2A%28+x+%2B+7+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8y+%2B+72+=+-9x+-+72+ ALIGN=MIDDLE  ALT=\"+8y+%2B+72+=+-9x+-+72+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+9x+%2B+8y+%2B+144+=+0+ ALIGN=MIDDLE  ALT=\"+9x+%2B+8y+%2B+144+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Here's a plot of the 2 lines:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+400%2C+400%2C+-20%2C+20%2C+-20%2C+20%2C+%288%2F9%29%2Ax+%2B+2%2F9%2C+-%289%2F8%29%2Ax++-+18%29+ ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );